Don't mean to necrobump this thread, but yeah, now that I have a D-50 I'm pretty convinced that's what was used here. I had a Juno-106 as a teenager, so I'm pretty familiar with that sound. But I would turn to the D-50 first.

In fact, it kinda sounds to me like the Fantasia preset with the PCM muted.

I loved Enya as a kid. I first heard that song when I was maybe four or so, and every time I hear it now as an adult, it's just so calming and nostalgic. But actually playing it now, on this instrument, is kind of amazing. I can hear my childhood is streaming out of these outputs.